The term is based on the fact that the prophylactics popular among South Asian Muslim men, including Saathi Condoms, Raja Condoms, Pakistani Panther Condoms & Pakistan Black Cobra Condoms, are produced solely in the global 'S'mall size & are extremely undersized by South Indian standards. It also alludes to the high failure rate of these 'Paki Rubbers', which, along with desensitising Islamic circumcision & the Muslim fondness for beef, is widely believed by Dravidians to be the reason for the observed high birth rate of Muslims.
Hyderabadi: You know what's the most difficult part of being a Thulukkan in South India?
Madrasan: Is it the Sambar?
Hyderabadi: No! It's having to order small-sized Thulukkan Aanurai for my tiny Paki Dick at the condom shop!
Madrasan: That's funny!
2) Lakshmi Rajaratnam: Did you hear about that girl Rekha Ravichandran? She married a Thulukkan!
Thenmozhi Mahadevan: So is it true those Pakis have small mukkal three-quarter penises?
Lakshmi Rajaratnam: Yes - she said he has to specially order small Thulukkan Aanurai from Pakistan!
3) Thamilan: Hey, Thulukkan! Bring me some Thulukkan Aanurai tomorrow!
Thulukkan: Fine, but I'm sure you'll break them with your Andhra Black Cobra!
Thamilan: Don't worry Paki Boy - they're for my 5-year old boy!
Thulukkan: Then they'll fit perfectly!
4) URINAL INSULT
Thirusangu: Haha, you must need those small-sized Thulukkan Aanurai to fit your Ali-Lingam!
Shamsuddin Khan: Yes - but mine is big for a Paki Boy!